If you expect to be understood, you use the simplest language for any communication. When I talk to someone, who's not familiar with the differences, I say "the big hole allowing more light and narrower depth of field set when using this small lens". A colleague shooting with me will understand "one four". Me and my girlfriend call the "EF 50 1.4" as "the smallie", so it could be "the smallie open". My cat runs away when he sees "the smallie" on the camera, as the noises and movements of the lens make him scary, so I have not to say anything, to make him dissapear. BTW - guys - do your cats react some funny way to some lens-body combinations? My cat reacts this way only when sees the one four.